What is the name for a sentence which is true on all of the rows of its truth ta

Question

What is the name for a sentence which is true on all of the rows of its truth table? (a) invalid (b) tautology (c) contradiction (d) contingent What is the name for a sentence which is true on exactly one of the rows of its truth table? (a) invalid (b) tautology (c) contradiction (d) contingent If A is F and B is F, what is the truth value of the sentence: A super set at (A & (approximately B V A))? (a) T (b) F (c) indeterminate (d) all of the above The premises of a valid argument give what kind of support to the conclusion of argument (a) true (b) deductive (c) inductive (d) truth-functional True or False: an argument can be sound but not valid. (a) True (b) False (c) It depends whether the premises are true or not This sentence is True: A super set at B. If B is False, what is the truth value of A? (a) True (b) False (c) Could be True or it could be False If 2 + 2 = 4 then all these answers are true. (a) this is the correct answer (b) this is not the correct answer (c) this is not the correct answer (d) this is not the correct answer

Explanation / Answer

I can give you answers of one question at a time

14)answer is b) Formulae that are true on all truth-value assignments are called TAUTOLOGIES.

Formulae that are false on every truth-value assignment are known as CONTRADICTORIES.

A CONTINGENT FORMULA is true on some truth-value assignments and false on others.

INVALID is, if there is some truth-value assignment that makes the premises of the argument true, but the conclusion false.

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